Personalized Mechanic Skull Long Sleeve T-Shirt. Mechanic skull! An angry skull with an open end wrench and socket wrench instead of crossbones, and metal wings behind it all. Cool gift for your favorite mechanic! Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL